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An Experimental Investigation of Capillary Driven Flow in Open Rectangular Channels: A Method to Create PDMS Microfilaments for pN Scale Force Measurements

Abstract The flow of liquid PDMS (10:1 v/v base to cross-linker ratio) in open, rectangular silicon micro channels, with and without a hexa-methyl-di-silazane (HMDS) or poly-tetra-fluoro-ethylene (PTFE) (120 nm) coat, was studied. Photolithographic patterning and etching of silicon wafers was used to create micro channels with a range of widths (5-50 μm) and depths (5-20 μm). The experimental PDMS flow rates were compared to an analytical model based on the work of Lucas and Washburn. The experimental flow rates closely matched the predicted flow rates for channels with an aspect ratio (width to depth), p, between one and two. Flow rates in channels with p less than one were higher than predicted whereas the opposite was true for ... (more)
Created Date 2014
Contributor Sowers, Timothy Wayne (Author) / Rajagopalan, Jagannathan (Advisor) / Herrmann, Marcus (Committee member) / Huang, Huei-Ping (Committee member) / Arizona State University (Publisher)
Subject Mechanical engineering / capillary / force sensor / meniscus morphology / Microchannel / Microfluidics / PDMS
Type Masters Thesis
Extent 63 pages
Language English
Reuse Permissions All Rights Reserved
Note Masters Thesis Mechanical Engineering 2014
Collaborating Institutions Graduate College / ASU Library
Additional Formats MODS / OAI Dublin Core / RIS

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